fix: Fixes #244. Concatenate balances to 2 decimal places on account overview page without rounding

* After entering a valid value and a recipient address, it works but the console displays error: `Uncaught TypeError: Cannot read property 'resolve' of null at flush (index.js:62)`

* On the 'Send THIBCoin' if you enter a valid value and a recipient address, the Tx Fee Estimate is shown as being the same value as the Amount, which is incorrect!

Fix non working squashing

Select default array from imported list of tokens

fix: Fixes BigNumber error due to incorrect number type

Support BIP39 recovery and use BIP39 for new accounts (fix #207 #199)

feat: Show Wei validation only when sending Ether. Other tokens use validation if input more than token dps

fix: Fixes #251. Show validation error when value to send decimal places exceeds max decimal places of token

fix: Fixes #248. Add validation warning when user tries to send ETH or a token to the zero account

Fixes error `Uncaught Error: lt() number type has more than 15 significant` that occurs when for example the users
balance is 0.999368704999999998, the tx fee is 0.000063 (i.e. 3Gwei * 21000)